Aggiunge copertina sponsor custom solo Premium Full, con override in wizard e slate sui nodi di streaming.

Permette upload da portale e app con ereditarietà partita→squadra→società, generazione MP4 via ffmpeg e distribuzione su home lab e nodi CPX per pause e assenza segnale.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/app/services/streams/cover_resolver.rb

@@ -0,0 +1,66 @@
+module Streams
+  # Catena effective cover: partita → squadra → società → default Match Live TV.
+  class CoverResolver
+    Result = Struct.new(:record, :source, :cover_url, :slate_local_path, keyword_init: true)
+
+    DEFAULT_COVER_URL = "/images/copertina-canale.png".freeze
+
+    def initialize(match)
+      @match = match
+      @team = match.team
+      @club = @team.club
+      @entitlements = @team.entitlements
+    end
+
+    def effective_cover_url
+      resolve&.cover_url || default_cover_url
+    end
+
+    def cover_source
+      resolve&.source || "default"
+    end
+
+    def resolve
+      return nil unless @entitlements.can_use_custom_cover?
+
+      candidates.each do |record, source|
+        next unless record.cover_image.attached?
+        next unless record.cover_slate.attached?
+
+        path = CoverSlatePaths.local_path_for(record)
+        next if path.blank?
+
+        return Result.new(
+          record: record,
+          source: source,
+          cover_url: blob_path(record.cover_image),
+          slate_local_path: path
+        )
+      end
+
+      nil
+    end
+
+    def default_cover_url
+      DEFAULT_COVER_URL
+    end
+
+    def default_slate_path
+      ENV.fetch("MEDIAMTX_SLATE_FILE", "/slates/offline.mp4")
+    end
+
+    private
+
+    def candidates
+      [
+        [@match, "match"],
+        [@team, "team"],
+        [@club, "club"]
+      ]
+    end
+
+    def blob_path(attachment)
+      Rails.application.routes.url_helpers.rails_blob_path(attachment, only_path: true)
+    end
+  end
+end